I am trying to install fcs on my linux Fedora core 3 but seems this version is
not valid for fedora:
Your distribution, unknown, is not supported by this
Macromedia Flash Communication Server MX installer.

How I can do? please help me:confused;

Try running the install script with the following:

Any idea if using ./installFCS -platformWarnOnly will allow me to install FCS
on Mandrake 10, assuming I am able to resolve the dependency?

I don't see why not, you have nothing to lose by trying it.

Try the above methods, if you get stuck along the way post the issues you are
having and I'm sure the community will be able to help.